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1、| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | BRITISH STANDARD BS EN 629-2 : 1996 The Eu
2、ropean Standard EN 629-2 : 1996 has the status of a British Standard ICS 23.020.30 NO COPYING WITHOUT BSI PERMISSION EXCEPT AS PERMITTED BY COPYRIGHT LAW Transportable gas cylinders 25E taper thread for connection of valves to gas cylinders Part 2. Gauge inspection This British Standard, having been
3、 prepared under the direction of the Engineering Sector Board, was published under the authority of the Standards Board and comes into effect on 15 December 1996 BSI 1996 The following BSI references relate to the work on this standard: Committee reference PVE/3/1 Draft for comment 92/72647 DC ISBN
4、0 580 26452 1 BS EN 629-2 : 1996 Amendments issued since publication Amd. No.DateText affected Committees responsible for this British Standard The preparation of this British Standard was entrusted by Technical Committee PVE/3, Gas containers, to Subcommittee PVE/3/1, Valve fittings for gas contain
5、ers, upon which the following bodies were represented: Aluminium Federation British Compressed Gases Association Health and Safety Executive Ministry of Defence Co-opted members BS EN 629-2 : 1996 BSI 1996i Contents Page Committees responsibleInside front cover National forewordii Foreword2 Text of
6、EN 629-23 ii BSI 1996 BS EN 629-2 : 1996 National foreword This British Standard has been prepared by Subcommittee PVE/3/1 and is the English language version of EN 629-2 : 1996 Transportable gas cylinders 25E taper thread for connection to gas cylinders Part 2: Gauge inspection, published by the Eu
7、ropean Committee for Standardization (CEN). EN 629-2 was produced as a result of international discussion in which the United Kingdom took part. Cross-references Publication referred toCorresponding British Standard EN 629-1 : 1996BS EN 629 Transportable gas cylinders 25E taper thread for connection
8、 to gas cylinders Part 1 : 1996 Specification Compliance with a British Standard does not of itself confer immunity from legal obligations. CEN European Committee for Standardization Comite Europe en de Normalisation Europa isches Komitee fu r Normung Central Secretariat: rue de Stassart 36, B-1050
9、Brussels 1996 All rights of reproduction and communication in any form and by any means reserved in all countries to CEN and its members. Ref. No. EN 629-2 : 1996 E EUROPEAN STANDARDEN 629-2 NORME EUROPE ENNE EUROPA ISCHE NORM June 1996 ICS 23.020.30 Descriptors: Gas cylinders, gas valves, junctions
10、, tapered screw threads, specifications, dimensions, dimensional measurements, standard gauges English version Transportable gas cylinders 25E taper thread for connection of valves to gas cylinders Part2: Gauge inspection Bouteilles a gaz transportables Filetages coniques 25E pour le raccordement de
11、s robinets sur les bouteilles a gaz Partie 2: Calibres de ve rification Ortsbewegliche Gasflaschen 25E kegeliges Gewinde zum Anschlub von Ventilen an Gasflaschen Teil 2: Lehrenpru fung This European Standard was approved by CEN on 1995-12-03. CEN members are bound to comply with the CEN/CENELEC Inte
12、rnal Regulations which stipulate the conditions for giving this European Standard the status of a national standard without any alteration. Up-to-date lists and bibliographical references concerning such national standards may be obtained on application to the Central Secretariat or to any CEN membe
13、r. This European Standard exists in three official versions (English, French, German). A version in any other language made by translation under the responsibility of a CEN member into its own language and notified to the Central Secretariat has the same status as the official versions. CEN members
14、are the national standards bodies of Austria, Belgium, Denmark, Finland, France, Germany, Greece, Iceland, Ireland, Italy, Luxembourg, Netherlands, Norway, Portugal, Spain, Sweden, Switzerland and United Kingdom. Page 2 EN 629-2 : 1996 BSI 1996 Foreword This European Standard has been prepared by Te
15、chnical Committee CEN/TC 23, Transportable gas cylinders, the secretariat of which is held by BSI. This European Standard shall be given the status of a national standard, either by publication of an identical text or by endorsement, at the latest by December 1996, and conflicting national standards
16、 shall be withdrawn at the latest by December 1996. According to the CEN/CENELEC Internal Regulations, the national standards organizations of the following countries are bound to implement this European Standard: Austria, Belgium, Denmark, Finland, France, Germany, Greece, Iceland, Ireland, Italy,
17、Luxembourg, Netherlands, Norway, Portugal, Spain, Sweden, Switzerland and the United Kingdom. Contents Page Foreword Introduction 1Scope3 2Normative reference3 3Definitions3 4Requirements3 5Gauge dimensions3 6Inspection gauges5 7Use of inspection gauges12 8Verification of inspection gauges13 9Identi
18、fication13 Annex A (informative) Examples of calculation for thread gauge dimensions on the large end diameter15 Annex B (informative) Limitations of gauging system15 Page 3 EN 629-2 : 1996 BSI 1996 Introduction This European Standard is a two part standard, belonging to a series of standards specif
19、ying thread dimensions and gauge requirements: Part 1: Specification; Part 2: Gauge inspection. 1 Scope This European Standard specifies types, dimensions and principles of use of gauges, to be used in conjunction with the taper thread specified in EN 629-1. Annex A provides examples of calculations
20、 for thread gauge dimensions on the large end diameter. Annex B draws attention to the limitations of the gauging system specified. 2 Normative reference This European Standard incorporates by dated or undated reference, provisions from other publications. These normative references are cited at the
21、 appropriate places in the text and the publications are listed hereafter. For dated references, subsequent amendments to or revisions of any of these publications apply to this European Standard only when incorporated in it by amendment or revision. For undated references the latest edition of the
22、publication referred to applies. EN 629-1Transportable gas cylinders 25E taper thread for connection of valves to gas cylinders Part 1: Specification 3 Definitions For the purposes of this standard, the following definitions apply. 3.1 inspection gauge Gauge used for the routine gauging of cylinder
23、neck and valve stem threads. This gauge is not used for checking other gauges. 3.2 check gauge Gauge for checking dimensional conformity of inspection ring gauges. This gauge is not used for gauging cylinder neck threads. 3.3 single part gauge Gauge of sufficient length to contact the full length of
24、 taper thread. These gauges are plug or ring, plain or threaded. 3.4 two part gauges Two separate inspection gauges, used in combination, where one is used to contact the large end of the taper cone and the other the small end. These sets of gauges are plug or ring, plain or threaded. 4 Requirements
25、 4.1 Materials All gauges shall be manufactured from material of suitable strength, stability and hardness. 4.2 Thread profile The thread profile of threaded inspection and check gauges shall be as shown in figure 1. 4.3 Thread rotation The thread shall be a right hand thread, such that it moves awa
26、y from an observer when rotated clockwise. 4.4 Taper Taper ratio:3 / 25; Taper angle:6 52; Taper slope:12%. 4.5 Thread profile The thread profile has a 55 angle. The form and thread height measurements are perpendicular to the cone surface (see figure 1). 4.6 Pitch P The pitch is 1,814 mm (derived f
27、rommm) 25,4 14 (see figure 1). 5 Gauge dimensions The following dimensional requirements apply to gauges shown in figure 2 to figure 15, inclusive. 5.1 All dimensions are given in millimetres. 5.2 Tolerances for specified dimensions on all gauges are: 0,01 mm on all lengths; 0,01 mm on diameters of
28、inspection gauges; mm on diameters of check gauges. 20,02 20,01 5.3 For threaded gauges, pitch diameters only are specified. For minor and major diameters see figure 1. 5.4 Unspecified dimensions shall be chosen by the manufacturer of the gauges. Page 4 EN 629-2 : 1996 BSI 1996 Major diameter Minor
29、diameter max. Minor diameter min. Pitch diameter Major diameter min. Minor diameter Pitch diameter Major diameter max. Ring gauge thread profile 1,742 = 0,2650,455 R 0,227 max. = 90 = = 90 55 Cone axis 0,265 max. 0,455 max. 1,742 = = Pitch P R 0,227 max. 2 Gauge plane Gauge plane Plug gauge thread p
30、rofile max. Figure 1. Thread profiles Page 5 EN 629-2 : 1996 BSI 1996 25,476 1 22 22,836 Figure 2. Plain plug gauge for minor diameters I-1 Pitch dia. = 26,638 Pitch dia. = 23,998 22 1 Figure 3. Threaded plug gauge for pitch diameters I-2 6 Inspection gauges All dimensions are given in millimetres 6
31、.1 Cylinder neck thread 6.1.1 Single part plug gauges Page 6 EN 629-2 : 1996 BSI 1996 1 22 22,836 8 Figure 4. Plain plug gauge for minor diameters I-3 22 1 Pitch dia. = 23,998 8 Figure 5. Threaded gauge for pitch diameters I-4 6.1.2 Two part plug gauges small end diameter Page 7 EN 629-2 : 1996 BSI
32、1996 1 8 25,476 Figure 6. Plain plug gauge for minor diameters I-5 Pitch dia.= 26,638 1 8 Figure 7. Threaded gauge for pitch diameters I-6 6.1.3 Two part plug gauges Large end diameter Page 8 EN 629-2 : 1996 BSI 1996 1 25,80 28,80 26 Figure 8. Plain ring gauge for major diameter I-7 Pitch dia. = 27,
33、638 26 1 Pitch dia. = 24,638 Figure 9. Threaded ring gauge for pitch diameter I-8 6.2 Valve stem thread 6.2.1 Single part ring gauges Page 9 EN 629-2 : 1996 BSI 1996 25,80 8 1 Figure 10. Plain ring gauge for major diameter I-9 1 8 Pitch dia. = 24,638 Figure 11. Threaded ring gauge for pitch diameter
34、 I-10 6.2.2 Two part ring gauges small end diameter Page 10 EN 629-2 : 1996 BSI 1996 1 28,80 8 26 Figure 12. Plain ring gauge for major diameter I-11 Pitch dia. = 27,638 8 26 1 Figure 13. Threaded ring gauge for pitch diameter I-12 6.2.3 Two part ring gauges large end diameter Page 11 EN 629-2 : 199
35、6 BSI 1996 28,8 25 25,80 0,25 Figure 14. Plain check gauge M-1 Pitch dia. = 27,638 Pitch dia. = 24,638 25 0,25 Figure 15. Threaded check gauge M-2 6.3 Check gauges Page 12 EN 629-2 : 1996 BSI 1996 Test surfaces Figure 16. Use of single part plug gauge 7 Use of inspection gauges 7.1 Plain gauges Plai
36、n gauges shall be lightly pressed into position or over the thread being gauged. Undue force shall not be used. 7.2 Threaded gauges Threaded gauges shall be screwed into or over the thread being gauged. Undue force shall not be used. 7.3 Accept or reject criteria, using plug gauges Thread acceptabil
37、ity to gauge is determined by the position of the plane at the mouth of the cylinder neck relative to the test surfaces of the gauge. The thread shall be considered acceptable to the gauge if this plane is flush with or falls between the test surfaces of the gauge when the gauge is fitted to the thr
38、ead (see figures 16 and 17). 7.4 Accept or reject criteria, using ring gauges Thread acceptability to gauge is determined by the position of the plane at the flat small end of the stem cone base relative to the test surfaces of the gauge. The thread shall be considered acceptable to the gauge if thi
39、s plane is flush with or falls between the test surfaces of the gauge when the gauge is fitted to the thread (see figures 18 and 19). 8 Verification of inspection gauges 8.1 General During use, inspection gauges will wear and can be damaged. The user shall ensure that the gauges are checked regularl
40、y to affirm that they remain within the specified dimensions. Frequency of checks required will depend upon usage and shall be the responsibility of the user. 8.2 Plug gauges Verification of inspection plug gauges shall be carried out directly, using optical or other suitable equipment. 8.3 Ring gau
41、ges Verification of inspection ring gauges cannot be carried out directly. Two check plug gauges, as shown in figure 14 and figure 15, shall be used. 8.4 Use of check gauges The plain check plug gauge shall be placed into the plain inspection ring gauge and the threaded check plug gauge shall be scr
42、ewed into the threaded inspection ring gauge. The inner stepped surface of the inspection ring gauge test surface shall be flush with, or within, either of the two test surfaces of the check gauge (see figure 20). Undue force shall not be used. Page 13 EN 629-2 : 1996 BSI 1996 Test surfacesTest surf
43、aces Figure 17. Use of two part plug gauge Test surfaces Figure 18. Use of single part ring gauge 9 Identification 9.1 Inspection gauges Inspection gauges shall be identified by the following information: EN 629; 25E; I- (followed by the appropriate number of the gauge, e.g. I-3). 9.2 Check gauges C
44、heck gauges shall be identified by the following information: EN 629; 25E; M- (followed by the appropriate number of the gauge, e.g. M-2). Page 14 EN 629-2 : 1996 BSI 1996 Test surfacesTest surfaces Figure 19. Use of two part ring gauge Test surfaces Check gauge Ring gauge Figure 20. Use of check ga
45、uges Page 15 EN 629-2 : 1996 BSI 1996 Annex A (informative) Examples of calculation for thread gauge dimensions on the large end diameter In the following examples the mid allowable value for pitch diameter is used. In practice the true pitch diameter is determined and used for calculation. All dime
46、nsions are given in millimetres. A.1 Threaded plug gauge I-2 according to figure 3 Thread profile in accordance with figure 1. Pitch diameter: 26,638; tolerance0,01 Major diameter: 26,638 + 1,742 2 (2 3 0,455) = 27,47; tolerance0,01 Minor diameter, theoretical, crest (Minor diameter 2 Minimum dimens
47、ion): 26,638 2 1,742 = 24,896. Minor diameter 2 Maximum dimension : 26,638 2 1,742 + (2 3 0,265) = 25,426 A.2 Threaded ring gauge I-8 according to figure 9 Thread profile in accordance with figure 1. Pitch diameter: 27,638; tolerance0,01 Minor diameter: 27,638 2 1,742 + (2 3 0,455) = 26,806; toleran
48、ce0,01 Major diameter, theoretical, crest (Major diameter 2 Maximum dimension): 27,638 + 1,742 = 29,38 Major diameter 2 Minimum dimension: 27,638 + 1,742 2 (2 3 0,265) = 28,85 A.3 Threaded check gauge M-2 according to figure 15 Thread profile in accordance with figure 1. Pitch diameter: 27,638; tole
49、rance: 20,02 20,01 Major diameter: 27,638 + 1,742 2 (2 3 0,455) = 28,47; tolerance 20,02 20,01 Minor diameter, theoretical, crest (Minor diameter 2 Minimum dimension): 27,638 2 1,742 = 25,896 Minor diameter 2 Maximum dimension: 27,638 2 1,742 + (2 3 0,265) = 26,426 Annex B (informative) Limitations of gauging system The purpose of this annex is to draw attention to the limitations of